mount -o extattr (extended attributes)

Hello
Here is a patch that adds mount -o extattr for auto-enabling UFS1
extended attributes.
http://ftp.espci.fr/shadow/manu/mount_extattr.patch
Any comment on it before I commit?
The next step is to add UFS_EXTATTR to GENERIC, XEN3_DOM0 and XEN3_DOMU
kernels (and others? which ones?). If there a smart way, or should I
do it for all ports?
--
Emmanuel Dreyfus
manu%netbsd.org@localhost